WELCOME TO IJL'S (OH5HOI) TECHNICAL PAGE'S

dec.24th.2000

COMMUNICATIONS RECEIVERS, MODS AND REPAIR:

 
ICOM IC-R70 AND IC-R71 RECEIVERS, MODS AND REPAIR

 
OLD RECEIVERS - REPAIR, MOD'S AND PHOTOGRAPH'S:

 
RA.1792 DESCRIPTION (temporary added)

RACAL RA.117 RECEIVER

RACAL RA.1217 RECEIVER

RA.1217 OPERATORS MANUAL,ONLY TEXT (PDF,716k)

RAY ROBINSON'S RA.329 (RA.217), TABLE TOP VERSION OF RA.1217 - TECHNICAL DESCRIPTION AND SCHEMATICS

COLLINS 51-J SERIES RECEIVERS

RACAL RA.117 SERVICE MANUAL

RACAL RA.117 SCHEMATIC 350 kb, GIF

TRIO 9R-59DS SCHEMATIC

BARLOW WADLEY XCR-30 SCHEMATIC

SERVICE MANUALS (IN FINNISH). A LIST OF MY MANUALS
(engl= in english, saks= in german, suom= in finnish)

TRANSISTORIZED VFO-CIRCUIT FOR COLLINS 51J...RECEIVER

EB5AGV'S RACAL PAGE - VERY FINE PICTURES !

RACAL RA117 MANUAL(DOC-FILE, ONLY TEXT )

RACAL RA117, MODIFICATION FOR EXTERNAL FILTER UNIT CONNECTION (1.6MHz SECOND I.F. USING RACAL ISB MODULATOR SIDEBAND FILTERS )

RACAL RA117 1st VFO UNIT (PICTURE)

RACAL RA117 2nd VFO UNIT (PICTURE)

RACAL RA217 RECEIVER AND VLF/LF CONVERTER (PICTURE)

RACAL RA217 RECEIVER - INSIDE VIEW (PICTURE)

RACAL RA117 AND SIEMENS E311 RECEIVERS AND ...(PICTURE)

SIEMENS E311 HF-RECEIVER (PICTURE)

REDIFON R 408 RECEIVER (PICTURE)

 
MISCELLANEOUS RADIO AND ELECTRONIC PROJECT'S:

 
SMD AMPLIFIER FOR MEDIUM WAVE LOOP ANTENNA

TRADITIONAL 40673 MOS-FET AMPLIFIER FOR MW LOOP

SYMMETRIC AMPLIFIER FOR MW LOOP (SMD) by OH1LFX

LIGHTNING PROTECTION CIRCUIT FOR PHONE LINE by OH3NGY

LIGHTNING PROTECTION CIRCUIT FOR LOW VOLTAGE CONTROL OR ALARM LINE

LIGHTNING AND STATIC OVERVOLTAGE PROTECTION COMPONENTS FOR BEVERAGE AND OTHER LONG WIRE ANTENNAS

IMPEDANCE BRIDGE FOR COARSE TESTING BETWEEN 20 - 800 OHM.(SCHEMATIC)

IMPEDANCE BRIDGE IS CONSTRUCTED IN VERY RUGGED MILITARY ALUMINIUM BOX

PRE-SELECTOR FOR MW-AND TROPICAL BANDS (SCHEMATIC)
(with antenna switching relays, balun transformer for long-wire antenna, second receiver channel with broadband RF-amplifier.... etc.)
PRE-SELECTOR (PRINTED CIRCUIT BOARD)
Mirror image for Press-n-Peel "PnP-Blue" film. Actual size: 130 x 76 mm !

BROADBAND RF AMPLIFIER FOR MEDIUMWAVE AND TROPICAL BANDS (SCHEMATIC)
BROADBAND RF-AMPLIFIER (PRINTED CIRCUIT BOARD)
Mirror image for Press-n-Peel "PnP-Blue" film. Actual size: 57 x 49 mm !

ANTENNA AMPLIFIER/SPLITTER FOR FOUR RECEIVER (SCHEMATIC)

ANTENNA SWITCHING SYSTEM FOR THREE ANTENNAS (SCHEMATIC)
AND PICTURE OF INDOOR AND OUTDOOR UNITS.

FOUR DIGIT FREQUENCY COUNTER (SCHEMATIC)

IF-PRESET FOR COUNTER (SHEMATIC)

ICM7217 AND ICM7207PIN CONNECTIONS.

TEMPERATURE CONTROLLER (LINEAR READOUT 0,1V/1 ^oC (SCHEMATIC)
WIRING DIAGRAM FOR TEMP.CONTROLLER SYSTEM


Translations: OH2TC and OH5HOI


Copyright 2000 Ilpo J. Leppänen

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